The principal aim of this survey is to ascertain the extent of corruption in service delivery in the public water sector in Machakos County and to determine how citizens understand and perceive it and how actual “users” of the system, including businesses and citizens have actually experienced it in practice. The survey aims at: providing knowledge on the extent of corruption in service delivery in the public water sector in the county; provide data on some of the empirically describable dimensions of corruption upon which governance and anti-corruption policies, strategies and measures should be formulated by the county; and measure perceptions relating to corruption and delivery of public service in the sector. The study was carried out between 16 and 21 September 2012 in the six constituencies that make up the County namely: Yatta, Masinga, Mwala, Kangundo, Kathiani and Machakos town constituencies. The study covered both rural and urban areas in the county targeting households and institutions.